2018 (vol. 28) - Number 4

*T. Kaczorek:*

A new method for computation of positive realizations of fractional linear continuous-time systems

*A. Biswas, A. Sarkar:*

Development of dual hesitant fuzzy prioritized operators based on Einstein operations with their application to multi-criteria group decision making

*L. Li, R. Zhang, J. Wang, X. Shang:*

Some q-orthopair linguistic Heronian mean operators with their application to multi-attribute group decision making

*J. Duda:*

Lyapunov matrices approach to the parametric optimization of a system with two delays and a PD controller

*M. Lhous, M. Rachik, El M. Magri:*

Ideal observability for bilinear discrete-time systems with and without delays in observation

*P.T. Anh, A. Babiarz, A. Czornik, M. Niezabitowski:*

Variation of constant formulas for fractional difference equations

*K. Bingi, R. Ibrahim, M. Noh Karsiti, S. Miya Hassan, V. Rajah Harindran:*

A comparative study of 2DOF PID and 2DOF fractional order PID controllers on a class of unstable systems

ACS Abstract:

**2001 (Volume 11)**

Number 1/2

**Monitoring and control of a class of distributed parameter bioreactors with application of the substrate consumption rate**

J.P.Babary(Centre National de la Recherche Scientifique, France) | J.Czeczot, M.Metzger(Silesian University of Technology, Poland) | M. Nihtilä(University of Kuopio, Finland) |

**keywords:** biotechnology, distributed parameter systems, monitoring, model-based adaptive control, recursive least-squares estimation.

**Optimal control for bilinear systems with delay on control**

A. Eljai(Université de Perpignan, France) | J. Karrakchou(Ecole Mohamadia d'Ingénieurs, Maroc) | M.Rachik, M.Lhous(Faculté des Sciences Ben M'sik, Maroc) |

**keywords:** optimal control, bilinear systems, delayed systems.

**On an NP-hard sorting problem**

K. Giaro(Technical University of Gdañsk, Poland) |

**keywords:** sorting problem, NP-hardness, flexible manufacturing systems.

**Low gain adaptive stabilization of undamped second order systems**

Toshihiro Kobayashi(Kyushu Institute of Technology, Japan) |

**keywords:** low-gain feedback, adaptive stabilization, undamped second order dynamical systems.

**Observability of a generalized linear control system**

Hubert Wysocki(Naval Academy, Poland) |

**keywords:** observability, linear differential systems, observability criteria, Bittner Operational Calculus.

**Very fast algorithm for nonholonomic optimal path planning and replanning, generalities and details**

Leszek Podsêdkowski(Technical University of £ód¼, Poland) |

^{*}searching of a graph built in a configuration space. Very good heuristic approximation of the real cost of the path accelerates path searching significantly. Due to dynamic modifications of the graph, the path replanning procedure is much faster than Brute-Force replanner. The paper presents general assumptions of the method, detailed algorithms of important procedures (especially the path replanning procedure) and a new form of Configuration Space and Open List. The simulation and experimental tests on car-like robot as well as the comparisons of this method to the others are also included.

**keywords:** nonholonomic robots, dynamic path planning, graph searching.

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